Infrared study of the adsorption of methanol on oxidised and reduced Cu/SiO2 catalysts

Millar, Graeme J., Rochester, Colin H., & Waugh, Kenneth C. (1991) Infrared study of the adsorption of methanol on oxidised and reduced Cu/SiO2 catalysts. Journal of the Chemical Society, Faraday Transactions, 87(17), pp. 2795-2804.

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Abstract

Infrared spectra are reported of methanol adsorbed at 295 K on reduced Cu/SiO2 and on Cu/SiO2 which had been preoxidised by exposure to excess nitrous oxide. Methanol was chemisorbed on reduced Cu/SiO2 to give methoxy species on both silica and copper, gave a trace of formate on copper via reaction with residual surface oxygen, and was weakly adsorbed at SiOH sites on the silica support. Heating the adsorbed species at 393 K led to the loss of methoxy groups on copper and the concomitant formation of a bidentate surface formate. Heating reduced Cu/SiO2 in methanol at 538 K initially gave both gaseous and adsorbed (on Cu) methyl formate which subsequently decomposed to CO and hydrogen. The reactions of methanol with oxidised Cu/SiO2 were similar to those for the reduced catalyst although surface oxygen promoted the formation of surface methoxy groups on copper. Subsequent heating at 393 K led first to unidentate formate before the appearance of bidentate formate.

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ID Code: 61973
Item Type: Journal Article
Refereed: Yes
Keywords: copper, catalyst, methanol, infrared
DOI: 10.1039/FT9918702795
ISSN: 1364-5455
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 1991 Royal Society of Chemistry
Copyright Statement: Restrictions on further re-use and further distribution
Deposited On: 21 Aug 2013 23:38
Last Modified: 21 Aug 2013 23:54

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